No matter how hard you try...no matter what you do there will be people you will never please. Literally, you could give them your right arm and they would want your left. The real test of your character comes when they do ask for our left arm instead of your right. Jaw dropped open you're left with some decisions.
Will you become outraged and lash out at them for ungratefulness? Will you respond in anger? Or will you hold your tongue and realize that their deep ungratefulness stems from somewhere in their past?
Honestly, I'm trying to be the person that holds her tongue, but usually I'm somewhere in between.